Ric - Don't know the precise origin of the word "wash" in washcoat, but a washcoat is merely a "thinned" coat of whatever the material is you're using (remember whitewash in Tom Sawyer?) It definitely is NOT sanding sealer, but you are right in that it is usually used as a means to "seal" one coat from another - in this case, to seal the color from the grain filler so as to make it more unlikely you would sand through the filler to the stain. Sometimes a thinned or "wash" coat is used to get deeper penetration into raw wood to show the grain better, too. In the case of Tom Sawyer, I guess it was to s-t-r-e-t-c-h the paint... Sanding sealer is a finish formulated with stearates added to make sanding it real easy - doesn't gum up or clog sandpaper - makes it wasy to provide a nice level surface for topcoating. Hope this helps... Mark Potter bases-loaded@juno.com On Tue, 5 Oct 1999 03:47:17 -0500 "Richard Moody" <remoody@easnet.net> writes: > > > ---------- > > From: Charles E Faulk <cfaulk2@juno.com> > > To: pianotech@ptg.org > > Subject: Re: Finishing question > > Date: Monday, October 04, 1999 9:20 PM > > > > > The best time to use a paste filler is after staining and after > applying > > a light sealer (or washcoat, as some call it). > > Wondering where that term came from. We used to get "wash thinner" > which was > cheaper than laquer thinner, but smelled like it... was used to > remove gunky > stripper from the wood. I didn't know "washcoat" but wondering if > that is what some > called sanding sealer?---ric >
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